golang json.Marshal 特殊html字符被转义的解决方法

go语言提供了json的编解码包，json字符串作为参数值传输时发现，json.marshal生成json特殊字符<、>、&会被转义。

type test struct {
  content   string
}
func main() {
  t := new(test)
  t.content = "http://www.baidu.com?id=123&test=1"
  jsonbyte, _ := json.marshal(t)
  fmt.println(string(jsonbyte))
}

{"content":"http://www.baidu.com?id=123\u0026test=1"}
process finished with exit code 0

godoc描述

string values encode as json strings coerced to valid utf-8,

replacing invalid bytes with the unicode replacement rune.

the angle brackets “<” and “>” are escaped to “\u003c” and “\u003e”

to keep some browsers from misinterpreting json output as html.

ampersand “&” is also escaped to “\u0026” for the same reason.

this escaping can be disabled using an encoder that had setescapehtml(false) alled on it.

json.marshal 默认 escapehtml 为true,会转义 <、>、&

func marshal(v interface{}) ([]byte, error) {
  e := &encodestate{}
  err := e.marshal(v, encopts{escapehtml: true})
  if err != nil {
    return nil, err
  }
  return e.bytes(), nil
}

解决方案

方法一：

content = strings.replace(content, "\\u003c", "<", -1)
content = strings.replace(content, "\\u003e", ">", -1)
content = strings.replace(content, "\\u0026", "&", -1)

这种方式比较直接，硬性字符串替换。比较憨厚

方法二：

文档中写到this escaping can be disabled using an encoder that had setescapehtml(false) alled on it.

我们先创建一个buffer用于存储json

创建一个jsonencoder

设置html编码为false

type test struct {
  content   string
}
func main() {
  t := new(test)
  t.content = "http://www.baidu.com?id=123&test=1"
  bf := bytes.newbuffer([]byte{})
  jsonencoder := json.newencoder(bf)
  jsonencoder.setescapehtml(false)
  jsonencoder.encode(t)
  fmt.println(bf.string())
}

{"content":"http://www.baidu.com?id=123&test=1"}
process finished with exit code 0

查看文档和源码还是解决问题的好方法。

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